15222551 has 4 divisors (see below), whose sum is σ = 15313872. Its totient is φ = 15131232.

The previous prime is 15222547. The next prime is 15222583. The reversal of 15222551 is 15522251.

15222551 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15522251 = 59 ⋅263089.

It is a cyclic number.

It is not a de Polignac number, because 15222551 - 2² = 15222547 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15222511) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 45410 + ... + 45743.

It is an arithmetic number, because the mean of its divisors is an integer number (3828468).

Almost surely, 2^15222551 is an apocalyptic number.

15222551 is a deficient number, since it is larger than the sum of its proper divisors (91321).

15222551 is an equidigital number, since it uses as much as digits as its factorization.

15222551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91320.

The product of its digits is 1000, while the sum is 23.

The square root of 15222551 is about 3901.6087707509. The cubic root of 15222551 is about 247.8349089856.

The spelling of 15222551 in words is "fifteen million, two hundred twenty-two thousand, five hundred fifty-one".